Making jam?? That is pretty scary. I think I could mix the ingredients together and check the jam for doneness, but I couldn’t sterilize jars correctly if my life depended on it.
That’s why this recipe seemed perfect – I love lemon and love berries. I would never be able to resist combining both in a jam to become the filling for a luscious butter cake, no sterilizing involved. Of course, a picture of the cake in the book was pretty convincing as well. :)

Don’t be put off by the different stages of this recipe – the result is worth every minute of the making. I halved the recipe and used two 15cm (6in) pans - don't do it like me and use larger pans.

Make the preserves first, since you’ll swirl some of it into the cake batter: purée the blueberries, with any juices they have exuded, in a blender or food processor. Pass the puré e through a coarse strainer or the medium disk of a food mill to remove the skins.

In a heavy medium nonreactive saucepan, combine the blueberry purée with the sugar, lemon juice, lemon zest, and ginger. Bring to a gentle boil over medium heat, stirring frequently to dissolve the sugar. Continue cooking, stirring often, for 20 minutes, until the preserves have thickened and are reduced to 1 cup. To check for proper thickness, place 1 to 2 teaspoons on a small china or glass plate and put it in the freezer until cold. Drag your finger through the thickened purée: a clear path should remain. If it's not ready, cook 5 minutes longer and repeat the test. Let the preserves cool, then cover and refrigerate for up to 5 days.

Prepare the cake: preheat the oven to 350ºF (175ºC). Butter the bottom and sides of three 8-inch (20cm) round cake pans. Line the bottom of each pan with a round of parchment or waxed paper and butter the paper.

In a mixer bowl, cream the butter, sugar, lemon zest, and lemon extract until light and fluffy. Gradually add the egg whites, 2 or 3 at a time, beating well between additions and stopping occasionally to scrape down the sides of the bowl.

Combine the flour, baking powder, and salt; whisk gently to blend. In 2 or 3 alternating additions, beat the dry ingredients and milk into the butter mixture, scraping down the sides of the bowl several times. Beat on medium-high speed for about 1 minute to smooth out any lumps and aerate the batter.

Scoop 1 cup of the batter into a small bowl. Divide the remainder equally among the 3 prepared cake pans, smoothing the tops with a rubber spatula. This gives you a "clean canvas" to work with. Add 2 1/2 tablespoons of the Lemon-Blueberry Preserves to the reserved batter and blend well. Drizzle heaping teaspoons of this blueberry mixture over the batter in the pans. Using a skewer or paring knife, swirl the blueberry mixture in short strokes to drag it down through the lemon batter without mixing it in.
Bake for about 25 minutes, or until a cake tester or wooden toothpick stuck into the center comes out clean and the cake begins to pull away from the sides of the pan. Let the layers cool in their pans for about 10 minutes, then turn out onto wire racks, carefully peel off the paper liners, and let cool completely, at least 1 hour.

Make the frosting: in a small nonreactive saucepan, combine the sugar and water. Bring to a boil over medium heat, stirring to dissolve the sugar. Continue to boil without stirring, occasionally washing down the sides of the pan with a wet pastry brush, until the syrup reaches the soft-ball stage, 238ºF (114ºC) on a candy thermometer. Immediately remove from the heat.

In a large mixer bowl, with an electric mixer on medium speed, beat the eggs briefly. Slowly add the hot syrup in a thin stream, pouring it down the sides of the bowl; be careful to avoid hitting the beaters, or the syrup may splatter. When all the syrup has been added, raise the speed to medium-high and beat until the mixture is very fluffy and cooled to body temperature. This can take 15 to 20 minutes.

Reduce the mixer speed to medium-low and gradually add the softened butter, 2 to 3 tablespoons at a time, beating well between additions. As you're adding the last few tablespoons of butter, the frosting will appear to break, then suddenly come together like whipped butter. Beat in the lemon juice, and the frosting is ready for use.

To assemble the cake: place a cake layer, flat side up, on a cake stand or serving plate. Spread half of the Lemon-Blueberry Preserves over the top. Place a second layer on top of the first and spread the remaining preserves over it. Finally, place the third layer on top of the second and frost the sides and top of the cake with the lemon buttercream Frosting. Decorate with fresh blueberries.

* if using frozen berries, measure them while frozen, then thaw completely in a bowl, saving any juices, before proceeding with the recipe.

** there’s no cake flour here in Brazil, so I used a substitute I found on the web: 1 cup cake flour = 7/8 cup (123g) all purpose flour + 2 tablespoons corn starch

When I saw the post title come in my RSS feed I thought, this is going to be hella pretty. And I was right! The flavor combination is great too (not to mention your diligence in making your own preserves!). I'm going to still kind of lean in your direction and say that 6-inch pans give just the perfect amount of cake for a small family, heh :)

We get cake flour here but I don't like buying it as it's such a hassle to store different types of flour. I do the substitution too. Just take note that for angel food cake, cake flour is a requirement as it is light enough to be dispersed in the meringue :)

The cake is simply gorgeous! I personally love making small cakes (I suppose it makes me feel like I'm sampling instead of pigging out?). You decorated it so simply and beautifully and what a great combo of flavors!

How gorgeous, and I love how pristine the outside looks and how colorful the cake looks. Plus, lemon buttercream? With blueberries? What a great delicious combination. (And I'm still laughing about Amy Winehouse as your doctor.)

How gorgeous, and I love how pristine the outside looks and how colorful the cake looks. Plus, lemon buttercream? With blueberries? What a great delicious combination. (And I'm still laughing about Amy Winehouse as your doctor.)

P - you are killing me with the whole Amy Winehouse thing, Is she not the scariest female ever..it's like she's the new Elvira, but she's not trying to be. I also have an unrational fear of steralizing and canning products so this would be perfect for me. Looks great.

I was so intrigued by this recipe that I made it for my mom's birthday this past weekend. Like you, I halved the recipe because there were only four of us. I also made a few changes. I added more lemon extract and lemon zest to the batter, because I like everything to be extra lemony.

I also found the frosting to be rather heavy...it tasted like lemon flavored butter to me. So I wound up adding a package of cream cheese to it, and extra lemon juice, and it was really great....so light and different and refreshing and everyone loved it....not to mention it was so pretty! Than you for sharing this wonderful recipe!

I've been reading your blog since I discovered it in January and I saw this cake when you posted it and immediately knew I would make it for my boyfriend's birthday (he has a slight obsession with blueberries) this month. It was delicious! I subbed out your frosting recipe for cream-cheese whipped cream frosting (neither of us like traditional frosting) and it came out wonderfully. Thanks again for the great recipe. I love your blog and our tips on cooking.

Hi, Beth!Thank you so much for your feedback - I'm glad to know you and your boyfriend liked the cake. And that frosting of yours sounds heavenly, too!Thank you for stopping by and letting me know about the recipe.